<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <p class="demo">hello JavaScript</p>
    <script>
      //获取<p class='demo'>hello JavaScript</p>内部文案
      const str = "<p class='demo'>hello JavaScript</p>";
      const reg = /^\<.+\>(.+)\<.+\>$/;
      const str1 = str.replace(reg, function (match, $1) {
        return $1;
      });
      console.log(str1);
    </script>
  </body>
</html>
